I've had a rummage through here, but haven't found anything that quite seems to cover my problem.
I've connected a new external Seagate hard disc to my Pi (the drive has its own power supply, but is routed via a powered hub).
I can cd into it and see that there are files (placed on there by Seagate), but it is read only.
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/media/Seagate Backup Plus Drive $ ls -lrt
total 204844
-r-------- 2 pi pi 1644118 Apr 27 2012 BackupPlusDeskIcon.ico
-r-------- 1 pi pi 38 Apr 27 2012 Autorun.inf
-r-------- 2 pi pi 152542064 Jun 7 2012 Seagate Dashboard Installer.exe
-r-------- 2 pi pi 55565161 Jun 7 2012 Seagate Dashboard Installer.dmg
dr-x------ 1 pi pi 0 Jul 28 2012 Seagate
dr-x------ 1 pi pi 4096 Jul 28 2012 Video
dr-x------ 1 pi pi 0 Mar 28 09:03 System Volume Information
dr-x------ 1 pi pi 0 Mar 28 09:03 $RECYCLE.BIN
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dmesg
[ 0.000000] Booting Linux on physical CPU 0
[ 0.000000] Initializing cgroup subsys cpu
[ 0.000000] Linux version 3.6.11+ (dc4@dc4-arm-01) (gcc version 4.7.2 20120731 (prerelease) (crosstool-NG linaro-1.13.1+bzr2458 - Linaro GCC 2012.08) ) #371 PREEMPT Thu Feb 7 16:31:35 GMT 2013
[ 0.000000] CPU: ARMv6-compatible processor [410fb767] revision 7 (ARMv7), cr=00c5387d
[ 0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT nonaliasing instruction cache
[ 0.000000] Machine: BCM2708
[ 0.000000] cma: CMA: reserved 16 MiB at 1b000000
[ 0.000000] Memory policy: ECC disabled, Data cache writeback
[ 0.000000] On node 0 totalpages: 114688
[ 0.000000] free_area_init_node: node 0, pgdat c053b834, node_mem_map c05e5000
[ 0.000000] Normal zone: 896 pages used for memmap
[ 0.000000] Normal zone: 0 pages reserved
[ 0.000000] Normal zone: 113792 pages, LIFO batch:31
[ 0.000000] pcpu-alloc: s0 r0 d32768 u32768 alloc=1*32768
[ 0.000000] pcpu-alloc: [0] 0
[ 0.000000] Built 1 zonelists in Zone order, mobility grouping on. Total pages: 113792
[ 0.000000] Kernel command line: dma.dmachans=0x7f35 bcm2708_fb.fbwidth=1824 bcm2708_fb.fbheight=984 bcm2708.boardrev=0xf bcm2708.serial=0x76492ae5 smsc95xx.macaddr=B8:27:EB:49:2A:E5 sdhci-bcm2708.emmc_clock_freq=100000000 vc_mem.mem_base=0x1ec00000 vc_mem.mem_size=0x20000000 dwc_otg.lpm_enable=0 console=ttyAMA0,115200 kgdboc=ttyAMA0,115200 console=tty1 root=/dev/mmcblk0p2 rootfstype=ext4 elevator=deadline rootwait
[ 0.000000] PID hash table entries: 2048 (order: 1, 8192 bytes)
[ 0.000000] Dentry cache hash table entries: 65536 (order: 6, 262144 bytes)
[ 0.000000] Inode-cache hash table entries: 32768 (order: 5, 131072 bytes)
[ 0.000000] Memory: 448MB = 448MB total
[ 0.000000] Memory: 432264k/432264k available, 26488k reserved, 0K highmem
[ 0.000000] Virtual kernel memory layout:
[ 0.000000] vector : 0xffff0000 - 0xffff1000 ( 4 kB)
[ 0.000000] fixmap : 0xfff00000 - 0xfffe0000 ( 896 kB)
[ 0.000000] vmalloc : 0xdc800000 - 0xff000000 ( 552 MB)
[ 0.000000] lowmem : 0xc0000000 - 0xdc000000 ( 448 MB)
[ 0.000000] modules : 0xbf000000 - 0xc0000000 ( 16 MB)
[ 0.000000] .text : 0xc0008000 - 0xc04e5470 (4982 kB)
[ 0.000000] .init : 0xc04e6000 - 0xc0506f24 ( 132 kB)
[ 0.000000] .data : 0xc0508000 - 0xc053c060 ( 209 kB)
[ 0.000000] .bss : 0xc053c084 - 0xc05e4738 ( 674 kB)
[ 0.000000] NR_IRQS:330
[ 0.000000] sched_clock: 32 bits at 1000kHz, resolution 1000ns, wraps every 4294967ms
[ 0.000000] Console: colour dummy device 80x30
[ 0.000000] console [tty1] enabled
[ 0.001006] Calibrating delay loop... 464.48 BogoMIPS (lpj=2322432)
[ 0.060065] pid_max: default: 32768 minimum: 301
[ 0.060418] Mount-cache hash table entries: 512
[ 0.061181] Initializing cgroup subsys cpuacct
[ 0.061235] Initializing cgroup subsys devices
[ 0.061268] Initializing cgroup subsys freezer
[ 0.061299] Initializing cgroup subsys blkio
[ 0.061393] CPU: Testing write buffer coherency: ok
[ 0.061728] hw perfevents: enabled with v6 PMU driver, 3 counters available
[ 0.061869] Setting up static identity map for 0x39d3f8 - 0x39d454
[ 0.063374] devtmpfs: initialized
[ 0.074117] NET: Registered protocol family 16
[ 0.080544] DMA: preallocated 4096 KiB pool for atomic coherent allocations
[ 0.081634] bcm2708.uart_clock = 0
[ 0.082993] hw-breakpoint: found 6 breakpoint and 1 watchpoint registers.
[ 0.083046] hw-breakpoint: maximum watchpoint size is 4 bytes.
[ 0.083082] mailbox: Broadcom VideoCore Mailbox driver
[ 0.083176] bcm2708_vcio: mailbox at f200b880
[ 0.083275] bcm_power: Broadcom power driver
[ 0.083313] bcm_power_open() -> 0
[ 0.083339] bcm_power_request(0, 8)
[ 0.584030] bcm_mailbox_read -> 00000080, 0
[ 0.584071] bcm_power_request -> 0
[ 0.584098] Serial: AMBA PL011 UART driver
[ 0.584242] dev:f1: ttyAMA0 at MMIO 0x20201000 (irq = 83) is a PL011 rev3
[ 0.908062] console [ttyAMA0] enabled
[ 0.931563] bio: create slab <bio-0> at 0
[ 0.936447] SCSI subsystem initialized
[ 0.940541] usbcore: registered new interface driver usbfs
[ 0.946123] usbcore: registered new interface driver hub
[ 0.951726] usbcore: registered new device driver usb
[ 0.958062] Switching to clocksource stc
[ 0.962304] FS-Cache: Loaded
[ 0.965450] CacheFiles: Loaded
[ 0.980244] NET: Registered protocol family 2
[ 0.985530] TCP established hash table entries: 16384 (order: 5, 131072 bytes)
[ 0.993264] TCP bind hash table entries: 16384 (order: 4, 65536 bytes)
[ 1.000052] TCP: Hash tables configured (established 16384 bind 16384)
[ 1.006657] TCP: reno registered
[ 1.009909] UDP hash table entries: 256 (order: 0, 4096 bytes)
[ 1.015805] UDP-Lite hash table entries: 256 (order: 0, 4096 bytes)
[ 1.022385] NET: Registered protocol family 1
[ 1.027247] RPC: Registered named UNIX socket transport module.
[ 1.033293] RPC: Registered udp transport module.
[ 1.038015] RPC: Registered tcp transport module.
[ 1.042759] RPC: Registered tcp NFSv4.1 backchannel transport module.
[ 1.049872] bcm2708_dma: DMA manager at f2007000
[ 1.054656] bcm2708_gpio: bcm2708_gpio_probe c0515d98
[ 1.060115] vc-mem: phys_addr:0x00000000 mem_base=0x1ec00000 mem_size:0x20000000(512 MiB)
[ 1.069267] audit: initializing netlink socket (disabled)
[ 1.074865] type=2000 audit(0.930:1): initialized
[ 1.197730] VFS: Disk quotas dquot_6.5.2
[ 1.201766] Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)
[ 1.208827] FS-Cache: Netfs 'nfs' registered for caching
[ 1.214576] NFS: Registering the id_resolver key type
[ 1.219767] Key type id_resolver registered
[ 1.224062] Key type id_legacy registered
[ 1.228422] msgmni has been set to 876
[ 1.233940] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 252)
[ 1.241644] io scheduler noop registered
[ 1.245689] io scheduler deadline registered (default)
[ 1.250871] io scheduler cfq registered
[ 1.289963] Console: switching to colour frame buffer device 228x61
[ 1.316394] kgdb: Registered I/O driver kgdboc.
[ 1.321699] vc-cma: Videocore CMA driver
[ 1.325801] vc-cma: vc_cma_base = 0x00000000
[ 1.330617] vc-cma: vc_cma_size = 0x00000000 (0 MiB)
[ 1.336169] vc-cma: vc_cma_initial = 0x00000000 (0 MiB)
[ 1.350769] brd: module loaded
[ 1.359027] loop: module loaded
[ 1.362713] vchiq: vchiq_init_state: slot_zero = 0xdb000000, is_master = 0
[ 1.370461] Loading iSCSI transport class v2.0-870.
[ 1.376441] usbcore: registered new interface driver smsc95xx
[ 1.382629] dwc_otg: version 3.00a 10-AUG-2012 (platform bus)
[ 1.593750] Core Release: 2.80a
[ 1.597015] Setting default values for core params
[ 1.601953] Finished setting default values for core params
[ 1.812801] Using Buffer DMA mode
[ 1.816226] Periodic Transfer Interrupt Enhancement - disabled
[ 1.822223] Multiprocessor Interrupt Enhancement - disabled
[ 1.827928] OTG VER PARAM: 0, OTG VER FLAG: 0
[ 1.832414] Dedicated Tx FIFOs mode
[ 1.836992] dwc_otg: Microframe scheduler enabled
[ 1.837413] dwc_otg bcm2708_usb: DWC OTG Controller
[ 1.842551] dwc_otg bcm2708_usb: new USB bus registered, assigned bus number 1
[ 1.850040] dwc_otg bcm2708_usb: irq 32, io mem 0x00000000
[ 1.855825] Init: Port Power? op_state=1
[ 1.859851] Init: Power Port (0)
[ 1.863298] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002
[ 1.870252] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[ 1.883076] usb usb1: Product: DWC OTG Controller
[ 1.893172] usb usb1: Manufacturer: Linux 3.6.11+ dwc_otg_hcd
[ 1.904321] usb usb1: SerialNumber: bcm2708_usb
[ 1.914948] hub 1-0:1.0: USB hub found
[ 1.924177] hub 1-0:1.0: 1 port detected
[ 1.933700] dwc_otg: FIQ enabled
[ 1.933718] dwc_otg: NAK holdoff enabled
[ 1.933739] Module dwc_common_port init
[ 1.933976] Initializing USB Mass Storage driver...
[ 1.944479] usbcore: registered new interface driver usb-storage
[ 1.955783] USB Mass Storage support registered.
[ 1.965886] usbcore: registered new interface driver libusual
[ 1.977324] mousedev: PS/2 mouse device common for all mice
[ 1.989161] bcm2835-cpufreq: min=700000 max=700000 cur=700000
[ 1.995024] bcm2835-cpufreq: switching to governor powersavebcm2835-cpufreq: switching to governor powersave
[ 2.010487] cpuidle: using governor ladder
[ 2.025564] cpuidle: using governor menu
[ 2.035016] sdhci: Secure Digital Host Controller Interface driver
[ 2.046687] sdhci: Copyright(c) Pierre Ossman
[ 2.056556] sdhci: Enable low-latency mode
[ 2.112359] mmc0: SDHCI controller on BCM2708_Arasan [platform] using platform's DMA
[ 2.125930] mmc0: BCM2708 SDHC host at 0x20300000 DMA 2 IRQ 77
[ 2.139434] Indeed it is in host mode hprt0 = 00021501
[ 2.150246] sdhci-pltfm: SDHCI platform and OF driver helper
[ 2.179602] usbcore: registered new interface driver usbhid
[ 2.212152] usbhid: USB HID core driver
[ 2.222070] TCP: cubic registered
[ 2.252240] Initializing XFRM netlink socket
[ 2.264365] mmc0: could read SD Status register (SSR) at the 2th attempt
[ 2.282190] NET: Registered protocol family 17
[ 2.302416] Key type dns_resolver registered
[ 2.317110] mmc0: new high speed SDHC card at address 1234
[ 2.313907] VFP support v0.3: implementor 41 architecture 1 part 20 variant b rev 5
[ 2.339227] mmcblk0: mmc0:1234 SA08G 7.28 GiB
[ 2.350150] registered taskstats version 1
[ 2.362339] mmcblk0: p1 p2
[ 2.432248] usb 1-1: new high-speed USB device number 2 using dwc_otg
[ 2.447016] Indeed it is in host mode hprt0 = 00001101
[ 2.662474] usb 1-1: New USB device found, idVendor=0424, idProduct=9512
[ 2.675169] usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[ 2.688870] hub 1-1:1.0: USB hub found
[ 2.698582] hub 1-1:1.0: 3 ports detected
[ 2.982430] usb 1-1.1: new high-speed USB device number 3 using dwc_otg
[ 3.092786] usb 1-1.1: New USB device found, idVendor=0424, idProduct=ec00
[ 3.105553] usb 1-1.1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[ 3.121549] smsc95xx v1.0.4
[ 3.187015] smsc95xx 1-1.1:1.0: eth0: register 'smsc95xx' at usb-bcm2708_usb-1.1, smsc95xx USB 2.0 Ethernet, b8:27:eb:49:2a:e5
[ 3.302454] usb 1-1.2: new high-speed USB device number 4 using dwc_otg
[ 3.414355] usb 1-1.2: New USB device found, idVendor=7392, idProduct=7811
[ 3.427327] usb 1-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 3.440594] usb 1-1.2: Product: 802.11n WLAN Adapter
[ 3.451572] usb 1-1.2: Manufacturer: Realtek
[ 3.461896] usb 1-1.2: SerialNumber: 00e04c000001
[ 3.552332] usb 1-1.3: new high-speed USB device number 5 using dwc_otg
[ 3.662973] usb 1-1.3: New USB device found, idVendor=1a40, idProduct=0101
[ 3.675949] usb 1-1.3: New USB device strings: Mfr=0, Product=1, SerialNumber=0
[ 3.689315] usb 1-1.3: Product: USB 2.0 Hub
[ 3.700395] hub 1-1.3:1.0: USB hub found
[ 3.710654] hub 1-1.3:1.0: 4 ports detected
[ 3.992403] usb 1-1.3.1: new low-speed USB device number 6 using dwc_otg
[ 4.108178] usb 1-1.3.1: New USB device found, idVendor=0461, idProduct=0010
[ 4.121329] usb 1-1.3.1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[ 4.134835] usb 1-1.3.1: Product: USB Keyboard
[ 4.145301] usb 1-1.3.1: Manufacturer: NOVATEK
[ 4.163596] input: NOVATEK USB Keyboard as /devices/platform/bcm2708_usb/usb1/1-1/1-1.3/1-1.3.1/1-1.3.1:1.0/input/input0
[ 4.183647] hid-generic 0003:0461:0010.0001: input,hidraw0: USB HID v1.10 Keyboard [NOVATEK USB Keyboard] on usb-bcm2708_usb-1.3.1/input0
[ 4.211491] input: NOVATEK USB Keyboard as /devices/platform/bcm2708_usb/usb1/1-1/1-1.3/1-1.3.1/1-1.3.1:1.1/input/input1
[ 4.229371] hid-generic 0003:0461:0010.0002: input,hidraw1: USB HID v1.10 Device [NOVATEK USB Keyboard] on usb-bcm2708_usb-1.3.1/input1
[ 4.322319] usb 1-1.3.2: new low-speed USB device number 7 using dwc_otg
[ 4.437096] usb 1-1.3.2: New USB device found, idVendor=046d, idProduct=c06a
[ 4.450754] usb 1-1.3.2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[ 4.464808] usb 1-1.3.2: Product: USB Optical Mouse
[ 4.476142] usb 1-1.3.2: Manufacturer: Logitech
[ 4.493082] input: Logitech USB Optical Mouse as /devices/platform/bcm2708_usb/usb1/1-1/1-1.3/1-1.3.2/1-1.3.2:1.0/input/input2
[ 4.511990] hid-generic 0003:046D:C06A.0003: input,hidraw2: USB HID v1.11 Mouse [Logitech USB Optical Mouse] on usb-bcm2708_usb-1.3.2/input0
[ 4.612361] usb 1-1.3.4: new high-speed USB device number 8 using dwc_otg
[ 4.754456] usb 1-1.3.4: New USB device found, idVendor=0bc2, idProduct=a0a4
[ 4.768361] usb 1-1.3.4: New USB device strings: Mfr=2, Product=3, SerialNumber=1
[ 4.782555] usb 1-1.3.4: Product: Backup+ Desk
[ 4.793683] usb 1-1.3.4: Manufacturer: Seagate
[ 4.804808] usb 1-1.3.4: SerialNumber: xxxxxxxx
[ 4.817574] scsi0 : usb-storage 1-1.3.4:1.0
[ 5.823423] scsi 0:0:0:0: Direct-Access Seagate Backup+ Desk 0503 PQ: 0 ANSI: 6
[ 5.840905] sd 0:0:0:0: [sda] 3907029167 512-byte logical blocks: (2.00 TB/1.81 TiB)
[ 5.859057] sd 0:0:0:0: [sda] Write Protect is off
[ 5.878412] sd 0:0:0:0: [sda] Mode Sense: 43 00 00 00
[ 5.879447] sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
[ 13.935974] sda: sda1
[ 13.949142] sd 0:0:0:0: [sda] Attached SCSI disk
[ 16.496671] EXT4-fs (mmcblk0p2): recovery complete
[ 16.511499] EXT4-fs (mmcblk0p2): mounted filesystem with ordered data mode. Opts: (null)
[ 16.526587] VFS: Mounted root (ext4 filesystem) on device 179:2.
[ 16.541569] devtmpfs: mounted
[ 16.552009] Freeing init memory: 128K
[ 17.983435] udevd[160]: starting version 175
[ 19.434500] Registered led device: led0
[ 20.829765] usbcore: registered new interface driver rtl8192cu
[ 34.095871] EXT4-fs (mmcblk0p2): re-mounted. Opts: (null)
[ 34.566079] EXT4-fs (mmcblk0p2): re-mounted. Opts: (null)
[ 35.386932] bcm2835 ALSA card created!
[ 35.409480] bcm2835 ALSA chip created!
[ 35.435573] bcm2835 ALSA chip created!
[ 35.453981] bcm2835 ALSA chip created!
[ 35.470159] bcm2835 ALSA chip created!
[ 35.485276] bcm2835 ALSA chip created!
[ 35.499366] bcm2835 ALSA chip created!
[ 35.512224] bcm2835 ALSA chip created!
[ 41.283975] mmc0: missed completion of cmd 18 DMA (512/512 [1]/[1]) - ignoring it
[ 41.297807] mmc0: DMA IRQ 6 ignored - results were reset
[ 59.042159] Adding 102396k swap on /var/swap. Priority:-1 extents:1 across:102396k SS
[ 97.602294] NTFS driver 2.1.30 [Flags: R/W MODULE].
[ 97.766386] NTFS volume version 3.1.
[ 97.766427] NTFS-fs error (device sda1): load_system_files(): Volume is dirty. Mounting read-only. Run chkdsk and mount in Windows.
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Mar 28 14:45:37 ffoilpi1 kernel: [ 84.403939] NTFS driver 2.1.30 [Flags: R/W MODULE].
Mar 28 14:45:37 ffoilpi1 kernel: [ 84.554968] NTFS volume version 3.1.
Mar 28 14:45:37 ffoilpi1 kernel: [ 84.555010] NTFS-fs error (device sda1): load_system_files(): Volume is dirty. Mounting read-only. Run chkdsk and mount in Windows.
I've seen suggestions that formatting it to ext3 is the way to go (I don't expect to connect it up to a Windows box). What is the safest way of going about this (and would it cure the above problem ?
Thanks