If it's ntfs formatted you have to look into captive. If fat or some linux type try:
sudo mount -o remount,rw /dev/sda1 /mnt/sda1
If it asks to specify filesystem add: -t vfat or whatever it is.
man mount has all mounting options listed.
I am cannot enable my hard drives to write. After mounting a drive, I right click on the drive and choose actions > change read/write mode. Prompt asks "Do you really want to change partition /dev/sda1 to be writable? I select yes, but it is still in read only. I have set root password and knoppix password. I have switched to su. Still cannot write to HDD.
If it's ntfs formatted you have to look into captive. If fat or some linux type try:
sudo mount -o remount,rw /dev/sda1 /mnt/sda1
If it asks to specify filesystem add: -t vfat or whatever it is.
man mount has all mounting options listed.
I should have added a more detail. I have 2 drives. /dev/hda is configured as hda1 (OS) 8Gb, hda2 (home) 8Gb, hda3 (swap) 2.65 Gb. /dev/sda is sda1 (data) 1Tb. All are formatted ext3 (except hda3). I think the problem is that I have been using gui's to long and believe everything I read. I was able to switch to SU then manually mount and rw.
Dell PowerEdge R730xd Server 2.60Ghz 32-Core 64GB 800GB SSD Debian Linux
$836.80
Watchguard XCS 570 Firewall SuperMicro 1U Server Intel 4GB VPN Router LINUX 🍁
$182.65
1U BareMetal pfsense opnsense Router Firewall DNS Server 6x 10GB Ethernet Ports
$149.00
PFSENSE 15" Depth Server Router Firewall Supermicro X11SSH-F E3-1240 V5 32GB RAM
$382.00
Domino Lotus Server 5.0.7 for OS/2 WSeB, RH Linux 6, Solaris, AIX, HP-UX, Win NT
$60.00
Red Hat Enterprise Linux 5 Server - New and Sealed
$16.99
IBM CS821 20-Core 2.827GHz 128Gb 1.92Tb SSD 1U Linux Server - 8005-12N Power 8
$449.96
IBM E850 Power8 2x 12C 3.02GHz 512Gb 1.8Tb SAS 10GbE 16Gb Linux Server 8408-E8E
$674.96
Australia - Win/Linux Server- 2GB RAM, 1 Core,100 GB HD, Ultd Bandwidth 2 yrs
$195.80
8x 240GB SSD 1U Rackmount Deduplication Compression Backup RAID Server X10DRW-iT
$499.00